If you’re going to be specifying any type of Personal Fall Arrest System, then reading and understanding OSHA 29CFR1910.66, Appendix C is an absolute must. This standard is very ‘performance’ oriented and can be found at OSHA’s web site (www.osha.gov).
Miller/Dalloz Fall Protection is a very...
Overhead cranes used in general industry are governed by OSHA 29CFR1910.179 and the ASME B30 series of standards.
None of these standards require the support beams (runway beams) to be marked with a capacity rating. OSHA 1910.179 requirements for capacity markings are the same as stated by...
In addition to the 2 standards mentioned above, you should also refer to the American National Standard ANSI MH27.1, "Specifications for Patented Track Underhung Cranes and Monorail Systems". This standard (referenced by the ASME B30.11) is published by the Monorail Manufacturers...
Archon Engineering has a software program called "Safety Line" that I think will give you the data you need (rope tension, horizontal and vertical end forces, final sag, etc.). The full program can be purchased for $20 and you can download a demo version for free (demo version is...
I'm certainly no expert on this issue, but it has been my experience that professional liability insurance can be difficult to obtain in some cases, depending on the nature of the work. For example, structural engineering has historically been considered high risk. Your boss may be having a hard...
I think if you research the OSHA regulations deep enough, you'll find more than one answer to your question. It appears to depend on just what type of work area you're talking about.
For example, 1910 Subpart S (1910.303 specifically) states that, for 600 volts or less, "The minimum...
fkd,
Actually, you are correct regarding the additional moments in the girder top flange. Testing on crane runway beams have shown additional stresses in the top flange that result from application of the local crane wheel load. AISE Technical Report No. 13 (Design Guide for Mill Buildings)...
I agree with gb156. You need to consider the twisting of the beam section between your panel points on the truss. Depending on your wheel spacing, the torsion on your runway beam may not be reduced that much by adding kickers.
I’m guessing you are going to have a difficult time getting the top...
According to the AISC "Specifications for Structural Joints Using ASTM A325 or A490 Bolts", (Manual of Steel Construction, ASD, Ninth Edition), bearing type connections may not be considered adequate for some applications, including joints subject to fatigue loading and/or significant...
I don't know for a fact, but I'm guessing the coefficients and equations were taken from FEM; Federation Europeena De La Manutention, as indicated on page 6 of the CMAA Specification No. 74 (1994 edition). Specifically, Local Girder Stresses, FEM.9.341 1st Edition (E) 10.1983. I've never seen...
According to the 1923 Edition of the “Pocket Companion”, published by the Carnegie Steel Company, the American Bridge Company Standard for structural rivets was as follows:
Diameter of full driven head = 1.5 times rivet diameter plus 1/8”.
(ie: diameter of full driven head of a 1” rivet =...
Camber on overhead crane girders does not signigicantly affect the strength of the girder section. Its only purpose is to control deflection of the girder relative to the horizontal and, like your old expert points out, to limit the potential of the trolley to drift towards the center when...
To my knowledge, CMAA has not published any design examples to accompany their specifications. In regard to CMAA Specification No. 70, I believe they were thinking about publishing such examples back in 1982 but never did. Somehow I did get a copy of a draft of these examples (which included...
You are quite correct. Neither OSHA or ANSI/ASME standards require annual load testing of overhead cranes used in general industry. Load testing is only required for new cranes and those which have been extensively repaired or altered. The term "extensively repaired" can be open to...
